Question

学长学姐们，帮忙解决一下高二数学题吗

学长学姐们，帮忙解决一下高二数学题吗过程详细点就采纳非常感谢帮忙

Answer 1

振幅是7周期是6π 相位是括号里的，初相是x＝0时

Answer 2

(16)
√2[cos(π/4)+isin(π/4)]
=1+i
(17)
|z| = 4
z
=4[cos(π/3)+isin(π/3)]
=4[ (1/2)+(√3/2)i]
=2 + 2√3i
(18)
|6i| =6
arg(6i) = π/2
z
=6[cos(π/2) +isin(π/2) ]
(19)
(x+yi)i +(y+4i) = (x-yi)(1+i)
(x+4)i = (x+y)+(x-y)i
=>
x+y =0 (1)
x+4=x-y (2)
from (2)
y=-4
from (1)
x=4
(x,y)=(4,-4)

Answer 3

解如图。

追答